// ConfigFileUtilities.cs
//
// Author:
//   Kirill Osenkov <https://github.com/KirillOsenkov>
//
// Copyright (c) 2017 Microsoft
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System.Linq;
using System.Xml.Linq;

namespace MonoDevelop.Projects.MSBuild
{
	class ConfigFileUtilities
	{
		/// <summary>
		/// If the given element already contains a subelement with the given name, modifies its attribute to include the given value.
		/// Otherwise inserts a new subelement with the given name and the desired attribute value.
		/// </summary>
		internal static void SetOrAppendSubelementAttributeValue (XElement element, string subelementName, string attributeName, string attributeValue)
		{
			var subelement = element.Elements ().FirstOrDefault (e => e.Name.LocalName == subelementName);
			if (subelement != null) {
				var existingValue = subelement.Attribute (attributeName);
				if (existingValue != null) {
					if (!existingValue.Value.Contains (attributeValue)) {
						existingValue.Value = existingValue.Value + ";" + attributeValue;
					}
				} else {
					subelement.SetAttributeValue (attributeName, attributeValue);
				}
			} else {
				subelement = new XElement (subelementName);
				subelement.SetAttributeValue (attributeName, attributeValue);
				element.AddFirst (subelement);
			}
		}
	}
}